diff --git a/ops/nixos/lib/common.nix b/ops/nixos/lib/common.nix
index 5cf81f3dee..597078b502 100644
--- a/ops/nixos/lib/common.nix
+++ b/ops/nixos/lib/common.nix
@@ -62,7 +62,7 @@ in
   };
   options.my.scrapeJournal.addr = lib.mkOption {
     type = lib.types.nullOr lib.types.str;
-    default = "${config.my.ip.tailscale}:19531";
+    default = if config.my.ip.tailscale == null then null else "${config.my.ip.tailscale}:19531";
   };
 
   config = {